saving grace vs state of grace

saving grace and state of grace both are nouns.

Word	Noun	Adjective	Verb	Adverb
saving grace	Yes	No	No	No
state of grace	Yes	No	No	No

As nouns, saving grace and state of grace are synonyms defined as:

saving grace and state of grace: (Christian theology) a state of sanctification by God; the state of one who is under such divine influence

Other synonyms of saving grace include grace.

saving grace (noun)	state of grace (noun)
a redeeming quality or characteristic	(Christian theology) a state of sanctification by God; the state of one who is under such divine influence
(Christian theology) a state of sanctification by God; the state of one who is under such divine influence